*, *:before, *:after {
  -webkit-box-sizing: border-box;
          box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  font-size: 10px;
}

body {
  background-color: #111;
}

main {
  background-color: #b8803b;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-pack: center;
      -ms-flex-pack: center;
          justify-content: center;
  -webkit-box-align: center;
      -ms-flex-align: center;
          align-items: center;
  height: 100vh;
  margin: auto;
  overflow: hidden;
  position: relative;
  -webkit-perspective: 720px;
          perspective: 720px;
  white-space: nowrap;
  max-width: 720px;
}

.column {
  position: absolute;
  -webkit-transform: translateZ(0);
          transform: translateZ(0);
}

.column:nth-child(2) {
  -webkit-transform: translateZ(-21em);
          transform: translateZ(-21em);
  z-index: -1;
}

.column:nth-child(3) {
  -webkit-transform: translateZ(-42em);
          transform: translateZ(-42em);
  z-index: -2;
}

.column:nth-child(4) {
  -webkit-transform: translateZ(-63em);
          transform: translateZ(-63em);
  z-index: -3;
}

.column:nth-child(5) {
  -webkit-transform: translateZ(-84em);
          transform: translateZ(-84em);
  z-index: -4;
}

.column:nth-child(6) {
  -webkit-transform: translateZ(-105em);
          transform: translateZ(-105em);
  z-index: -5;
}

.column:nth-child(7) {
  -webkit-transform: translateZ(-126em);
          transform: translateZ(-126em);
  z-index: -6;
}

.column:nth-child(8) {
  -webkit-transform: translateZ(-147em);
          transform: translateZ(-147em);
  z-index: -7;
}

.column:nth-child(9) {
  -webkit-transform: translateZ(-168em);
          transform: translateZ(-168em);
  z-index: -8;
}

.soldier {
  -webkit-animation: march 2.5s ease-out infinite;
          animation: march 2.5s ease-out infinite;
  display: inline-block;
  position: relative;
  width: 15em;
  height: 21em;
  -webkit-transform: translate(-50%);
          transform: translate(-50%);
  will-change: transform;
  z-index: 0;
}

.soldier div {
  position: absolute;
}

/* Uniform color */
.torso, .hat {
  background-color: #a02;
}

/* Skin */
.head, .hand {
  background-color: #fdb;
}

/* Head */
.head {
  background-image: linear-gradient(85deg, transparent 55%, #fff 55%, #fff 65%, transparent 65%);
  border-radius: 50%;
  top: -2.6em;
  left: 0;
  width: 3em;
  height: 3em;
}

.hat {
  background-image: radial-gradient(1.5em 0.25em at 100% 65%, #fff 1.4em, transparent 1.5em);
  border-radius: 50% / 0.25em;
  bottom: 2em;
  height: 4.5em;
  width: 3em;
  z-index: 1;
}

.visor {
  background-color: #000;
  border-radius: 50%;
  top: 0.6em;
  left: 1.5em;
  height: 0.5em;
  width: 2.5em;
}

/* Torso */
.torso {
  background-image: radial-gradient(2.5em 1em at 50% 0, transparent 60%, #fff 60%, #fff 99%, transparent 99%), radial-gradient(6em 4em at 50% 0, transparent 85%, #fff 85%, #fff 99%, transparent 99%);
  border-radius: 2em 2em 0.4em 0.4em;
  top: 6em;
  left: 6em;
  width: 3em;
  height: 7em;
  -webkit-transform-origin: 50% 6em;
          transform-origin: 50% 6em;
}

.wind-up-handle {
  -webkit-animation: unwind 2.5s linear infinite;
          animation: unwind 2.5s linear infinite;
  background: radial-gradient(0.5em 0.5em at 0.5em 0.5em, transparent 39%, #ccc 40%, #ccc 98%, transparent 99%), radial-gradient(0.5em 0.5em at 0.5em 1.5em, transparent 39%, #ccc 40%, #ccc 98%, transparent 99%), -webkit-gradient(linear, left top, left bottom, color-stop(40%, transparent), color-stop(40%, #ccc), color-stop(60%, #ccc), color-stop(60%, transparent)) 0.2em 0 no-repeat;
  background: radial-gradient(0.5em 0.5em at 0.5em 0.5em, transparent 39%, #ccc 40%, #ccc 98%, transparent 99%), radial-gradient(0.5em 0.5em at 0.5em 1.5em, transparent 39%, #ccc 40%, #ccc 98%, transparent 99%), linear-gradient(transparent 40%, #ccc 40%, #ccc 60%, transparent 60%) 0.2em 0 no-repeat;
  top: 50%;
  right: 100%;
  width: 1.5em;
  height: 2em;
}

/* Pivot points and animations for arms and legs */
.left-arm, .right-arm, .left-leg, .right-leg, .ankle {
  -webkit-transform-origin: 1em 1em;
          transform-origin: 1em 1em;
}

.right-arm, .left-leg, .right-leg {
  -webkit-animation: pivot 1.25s ease-out infinite;
          animation: pivot 1.25s ease-out infinite;
}

.left-arm, .left-leg {
  -webkit-animation-delay: -0.625s;
          animation-delay: -0.625s;
}

/* Arms */
.left-arm, .right-arm {
  background-color: #c24;
}

.left-arm {
  -webkit-animation: rock 1.25s ease-out infinite;
          animation: rock 1.25s ease-out infinite;
  background-image: -webkit-gradient(linear, left top, left bottom, color-stop(68%, transparent), color-stop(68%, #fff));
  background-image: linear-gradient(transparent 68%, #fff 68%);
  top: 2.75em;
  left: 1em;
  width: 2em;
  height: 3em;
  -webkit-transform: rotate(-60deg);
          transform: rotate(-60deg);
  -webkit-transform-origin: 50% 0;
          transform-origin: 50% 0;
  z-index: -1;
}

.right-arm {
  background-image: -webkit-gradient(linear, left top, left bottom, color-stop(84%, transparent), color-stop(84%, #fff));
  background-image: linear-gradient(transparent 84%, #fff 84%);
  border-radius: 1em 1em 0 0;
  top: 0.5em;
  left: 0.5em;
  width: 2em;
  height: 6em;
  z-index: 1;
}

/* Musket parts */
.musket, .butt {
  background-color: #222;
}

.musket {
  border-radius: 0.3em 0.3em 0 0;
  width: 0.7em;
  height: 11em;
  left: 2.5em;
  bottom: 0.5em;
}

.bayonet {
  -webkit-box-shadow: -0.2em -0.4em 0 #333 inset;
          box-shadow: -0.2em -0.4em 0 #333 inset;
  bottom: 95%;
  width: 1em;
  height: 4em;
}

.butt {
  background-color: #222;
  border-radius: 0.3em;
  right: 0;
  top: 9em;
  width: 1.1em;
  height: 3.5em;
}

/* Hand positions */
.hand {
  top: 100%;
}

.left-arm .hand {
  border-radius: 0.5em 1em 1em 1em;
  left: 25%;
  width: 2.5em;
  height: 1.5em;
}

.right-arm .hand {
  border-radius: 0.5em 0.5em 50% 50%;
  top: 100%;
  height: 2em;
  width: 2em;
}

/* Legs */
.left-leg, .right-leg, .ankle, .foot {
  background-color: #111;
}

.left-leg, .right-leg, .ankle {
  width: 2em;
  height: 5.5em;
}

.left-leg, .right-leg {
  border-radius: 1em;
  top: 6em;
  left: 0.5em;
}

.ankle {
  border-radius: 1em 1em 0 0;
  top: 3.5em;
}

.foot {
  border-radius: 1em 2em 1em 0.5em /  1.5em 1.5em 0.5em 0.5em;
  top: 4.5em;
  left: -0.3em;
  width: 3.5em;
  height: 1em;
}

@-webkit-keyframes march {
  from {
    -webkit-transform: translateX(-50%);
            transform: translateX(-50%);
  }
  25% {
    -webkit-transform: translateX(-25%);
            transform: translateX(-25%);
  }
  50% {
    -webkit-transform: translateX(0);
            transform: translateX(0);
  }
  75% {
    -webkit-transform: translateX(25%);
            transform: translateX(25%);
  }
  to {
    -webkit-transform: translateX(50%);
            transform: translateX(50%);
  }
}

@keyframes march {
  from {
    -webkit-transform: translateX(-50%);
            transform: translateX(-50%);
  }
  25% {
    -webkit-transform: translateX(-25%);
            transform: translateX(-25%);
  }
  50% {
    -webkit-transform: translateX(0);
            transform: translateX(0);
  }
  75% {
    -webkit-transform: translateX(25%);
            transform: translateX(25%);
  }
  to {
    -webkit-transform: translateX(50%);
            transform: translateX(50%);
  }
}

@-webkit-keyframes pivot {
  from, to {
    -webkit-transform: rotate(22deg);
            transform: rotate(22deg);
  }
  50% {
    -webkit-transform: rotate(-22deg);
            transform: rotate(-22deg);
  }
}

@keyframes pivot {
  from, to {
    -webkit-transform: rotate(22deg);
            transform: rotate(22deg);
  }
  50% {
    -webkit-transform: rotate(-22deg);
            transform: rotate(-22deg);
  }
}

@-webkit-keyframes rock {
  from, to {
    -webkit-transform: rotate(-60deg);
            transform: rotate(-60deg);
  }
  50% {
    -webkit-transform: rotate(-62deg);
            transform: rotate(-62deg);
  }
}

@keyframes rock {
  from, to {
    -webkit-transform: rotate(-60deg);
            transform: rotate(-60deg);
  }
  50% {
    -webkit-transform: rotate(-62deg);
            transform: rotate(-62deg);
  }
}

@-webkit-keyframes unwind {
  from {
    -webkit-transform: rotateX(0);
            transform: rotateX(0);
  }
  to {
    -webkit-transform: rotateX(1turn);
            transform: rotateX(1turn);
  }
}

@keyframes unwind {
  from {
    -webkit-transform: rotateX(0);
            transform: rotateX(0);
  }
  to {
    -webkit-transform: rotateX(1turn);
            transform: rotateX(1turn);
  }
}

/* Hide some offscreen soldiers based on viewport for performance reason */
@media screen and (max-width: 500px) {
  .soldier:first-child, .soldier:last-child {
    visibility: hidden;
  }
}

@media screen and (max-width: 320px) {
  .soldier:nth-child(-n + 2), .soldier:nth-child(n + 7) {
    visibility: hidden;
  }
}
